Cased DP system

{
  "id": "MLC-T-ENV-004293",
  "term": "Cased DP system",
  "field": "Environment",
  "definition": "A rod system consisting of inner rods and outer drive casing. Also referred to as \"dual-tube\" DP systems. The soil sampling barrel is attached to inner rods. The inner rods and outer casing are typically driven simultaneously. The sampling tool is then withdrawn, emptied, and re-inserted, while the outer drive casing is left in the ground to keep the hole open. Minimizes sloughing and contamination of soil samples.",
  "subject": "Land, waste and cleanup",
  "references": [
    "Underground Storage Tank Sites Guide Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/cased-dp-system/"
}